CN108680803B - Battery simulation system and method supporting BMS active equalization function test - Google Patents
Battery simulation system and method supporting BMS active equalization function test Download PDFInfo
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- CN108680803B CN108680803B CN201810420493.2A CN201810420493A CN108680803B CN 108680803 B CN108680803 B CN 108680803B CN 201810420493 A CN201810420493 A CN 201810420493A CN 108680803 B CN108680803 B CN 108680803B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a battery simulation system supporting BMS active equalization function test.A main control module of the system is used for transmitting an adjustable linear power supply output voltage set value and an adjustable linear power supply overcurrent protection set value to an adjustable linear power supply and transmitting an impedance adjustable load voltage set value and an impedance adjustable load overcurrent protection set value to an impedance adjustable load; the adjustable linear power supply is used for outputting corresponding voltage, so that the system output voltage is equal to the set value of the output voltage of the adjustable linear power supply, and a corresponding overcurrent protection threshold is set; the impedance adjustable load adjusts the self impedance, so that the voltage of the output end of the system is stabilized at the voltage set value of the impedance adjustable load, and the overcurrent protection threshold is set. The invention realizes the requirement of simulating the bidirectional flow of the battery voltage and the balance current.
Description
Technical Field
The invention relates to the technical field of battery management system testing, in particular to a battery simulation system and method for supporting BMS active equalization function testing.
Background
The BATTERY management system (BMS, BATTERY MANAGEMENT SYSTEM) is an important component of electric vehicles and energy storage systems, and currently, a high-precision adjustable voltage source is generally used to simulate BATTERY voltage when testing BMS functions, which is feasible for a BATTERY management system using passive equalization, but cannot meet the test requirements of a BATTERY management system having an active equalization function. For a battery management system adopting passive balance, when the battery management system is in a balanced state, an internal balance circuit is equivalent to a resistive load, so that the battery voltage is simulated only through an adjustable voltage source during testing, and enough balance current is provided. However, for the battery management system with the active balancing function, the balancing function of the battery management system has two states of charge balancing and discharge balancing, when the battery management system is in the discharge balancing state, a balancing circuit in the battery management system is equivalent to a constant current load, and the test can be realized by using an adjustable voltage source; when the battery management system is in a charge equalization state, the equalization circuit in the battery management system is equivalent to a constant current power supply, and the adjustable voltage source cannot absorb equalization current, so that the test cannot be completed.
At present, a conventional battery is generally adopted for testing a battery management system with an active balancing function, however, the voltage of the battery cannot be adjusted at any time according to needs, so that the testing process is complicated, and the testing efficiency of the battery management system is influenced.
Disclosure of Invention
The invention aims to provide a battery simulation system and a method for supporting BMS active equalization function test, which adopt a mode of combining an adjustable linear power supply and an adjustable load, and when the battery simulation system is used for active equalization function test, the requirements of simulating battery voltage and balancing current bidirectional flowing are realized.
In order to achieve the purpose, the battery simulation system supporting the BMS active balancing function test comprises a main control module, an adjustable linear power supply, an impedance adjustable load and a voltage sampling module, wherein the main control module is used for transmitting an adjustable linear power supply output voltage set value and an adjustable linear power supply overcurrent protection set value to the adjustable linear power supply and transmitting an impedance adjustable load voltage set value and an impedance adjustable load overcurrent protection set value to the impedance adjustable load;
the voltage sampling module is used for collecting the voltage of the output end of the battery simulation system and respectively transmitting voltage sampling values to the adjustable linear power supply and the impedance adjustable load;
the adjustable linear power supply is used for outputting corresponding voltage according to a comparison result of an output voltage set value of the adjustable linear power supply and a voltage sampling value output by the sampling module, controlling the voltage sampling value to be equal to the output voltage set value of the adjustable linear power supply, and setting a corresponding overcurrent protection threshold according to an overcurrent protection set value of the adjustable linear power supply;
the impedance adjustable load is used for dynamically adjusting self impedance according to a comparison result of an impedance adjustable load voltage set value and a voltage sampling value output by the voltage sampling module, so that the voltage of the output end of the battery simulation system is stabilized at the impedance adjustable load voltage set value, and a corresponding overcurrent protection threshold is set according to the impedance adjustable load overcurrent protection set value.
The first current sampling module is used for collecting the current of the output end of the adjustable linear power supply and transmitting the current of the output end of the adjustable linear power supply to the adjustable linear power supply, the adjustable linear power supply compares the current of the output end of the adjustable linear power supply with an adjustable linear power supply over-current protection set value, when the current of the output end of the adjustable linear power supply is smaller than the adjustable linear power supply over-current protection set value, the adjustable linear power supply outputs corresponding voltage according to the comparison result of the adjustable linear power supply output voltage set value and a voltage sampling value output by the sampling module, and the voltage sampling value is controlled to be equal to the adjustable; when the current of the output end of the adjustable linear power supply is larger than or equal to the overcurrent protection set value of the adjustable linear power supply, the output of the adjustable linear power supply is controlled by the comparison result of the overcurrent protection set value of the adjustable linear power supply and the current of the output end of the adjustable linear power supply, so that the output current of the adjustable linear power supply is equal to the overcurrent protection set value of the adjustable linear power supply.
The second current sampling module is used for collecting current flowing through the impedance adjustable load and transmitting the current flowing through the impedance adjustable load to the impedance adjustable load, the impedance adjustable load compares the current flowing through the impedance adjustable load with an impedance adjustable load overcurrent protection set value, and when the current flowing through the impedance adjustable load is smaller than the impedance adjustable load overcurrent protection set value, the impedance of the impedance adjustable load is dynamically adjusted according to a comparison result of an impedance adjustable load voltage set value and a voltage sampling value output by the sampling module, so that the voltage of the output end of the battery simulation system is stabilized at the impedance adjustable load voltage set value; when the current flowing through the impedance adjustable load is larger than or equal to the impedance adjustable load overcurrent protection set value, the impedance of the impedance adjustable load is controlled by the comparison result of the impedance adjustable load overcurrent protection set value and the current flowing through the impedance adjustable load, so that the current flowing through the adjustable load is limited to the impedance adjustable load overcurrent protection set value.
A battery simulation method of the system is characterized by comprising the following steps:
step 1: the main control module transmits an adjustable linear power supply output voltage set value and an adjustable linear power supply over-current protection set value to the adjustable linear power supply, and transmits an impedance adjustable load voltage set value and an impedance adjustable load over-current protection set value to the impedance adjustable load;
step 2: the voltage sampling module collects the voltage of the output end of the battery simulation system and respectively transmits the voltage sampling values to the adjustable linear power supply and the impedance adjustable load;
and step 3: the adjustable linear power supply outputs corresponding voltage according to a comparison result of an output voltage set value of the adjustable linear power supply and a voltage sampling value output by the voltage sampling module, controls the voltage sampling value to be equal to the output voltage set value of the adjustable linear power supply, and sets a corresponding overcurrent protection threshold according to an overcurrent protection set value of the adjustable linear power supply;
and 4, step 4: the impedance adjustable load dynamically adjusts the impedance of the impedance adjustable load according to the comparison result of the voltage set value of the impedance adjustable load and the voltage sampling value output by the voltage sampling module, so that the voltage of the output end of the battery simulation system is stabilized at the voltage set value of the impedance adjustable load, and a corresponding overcurrent protection threshold is set according to the overcurrent protection set value of the impedance adjustable load.
And 5: the first current sampling module collects the current of the output end of the adjustable linear power supply and transmits the current of the output end of the adjustable linear power supply to the adjustable linear power supply, the adjustable linear power supply compares the current of the output end of the adjustable linear power supply with the overcurrent protection set value of the adjustable linear power supply, when the current of the output end of the adjustable linear power supply is smaller than the overcurrent protection set value of the adjustable linear power supply, the adjustable linear power supply outputs corresponding voltage according to the comparison result of the output voltage set value of the adjustable linear power supply and the voltage sampling value output by the sampling module, and the voltage sampling value is controlled to be equal to the output; when the current of the output end of the adjustable linear power supply is larger than or equal to the overcurrent protection set value of the adjustable linear power supply, the output of the adjustable linear power supply is controlled by the comparison result of the overcurrent protection set value of the adjustable linear power supply and the current of the output end of the adjustable linear power supply, so that the output current of the adjustable linear power supply is equal to the overcurrent protection set value of the adjustable linear power supply;
the second current sampling module collects current flowing through the impedance adjustable load and transmits the current flowing through the impedance adjustable load to the impedance adjustable load, the impedance adjustable load compares the current flowing through the impedance adjustable load with an impedance adjustable load overcurrent protection set value, and when the current flowing through the impedance adjustable load is smaller than the impedance adjustable load overcurrent protection set value, the impedance of the impedance adjustable load is dynamically adjusted according to a comparison result of an impedance adjustable load voltage set value and a voltage sampling value output by the sampling module, so that the voltage of the output end of the battery simulation system is stabilized at the impedance adjustable load voltage set value; when the current flowing through the impedance adjustable load is larger than or equal to the impedance adjustable load overcurrent protection set value, the impedance of the impedance adjustable load is controlled by the comparison result of the impedance adjustable load overcurrent protection set value and the current flowing through the impedance adjustable load, so that the current flowing through the adjustable load is limited to the impedance adjustable load overcurrent protection set value;
step 6: the voltage sampling module is also used for transmitting the voltage sampling value to the main control module, and the main control module respectively compares the voltage sampling value with an adjustable linear power supply output voltage set value and an impedance adjustable load voltage set value so as to judge whether the adjustable linear power supply and the impedance adjustable load have faults or not;
the first current sampling module transmits the current of the output end of the adjustable linear power supply to the main control module, and the main control module compares the current of the output end of the adjustable linear power supply with an overcurrent protection set value of the adjustable linear power supply so as to judge whether the adjustable linear power supply has a fault or not;
the second current sampling module transmits the current flowing through the impedance adjustable load to the main control module, and the main control module compares the current flowing through the impedance adjustable load with an impedance adjustable load overcurrent protection set value so as to judge whether the impedance adjustable load has a fault.
The battery simulation system can automatically adapt to different working states of a battery management system to be tested, including sampling, charge equalization and discharge equalization states, and does not need to manually set a mode; in addition, when the active equalization function test is carried out by using the device, the requirement of simulating the battery voltage is realized by controlling the output voltage by the adjustable linear power supply, and in addition, in the charging equalization process, the current flows into the impedance adjustable load of the device from the battery management system, and in the discharging equalization process, the current flows into the battery management system from the adjustable linear power supply. Meanwhile, the invention has the functions of overvoltage and overcurrent protection through the feedback current and voltage, and has higher safety and reliability.
Drawings
FIG. 1 is a block diagram of the present invention.
Fig. 2 is a simplified schematic diagram of the battery management system during discharge equalization according to the present invention.
Fig. 3 is a simplified schematic diagram of charge equalization of the battery management system of the present invention.
In the figure, 1 is a main control module, 2 is an adjustable linear power supply, 3 is an impedance adjustable load, 4 is a voltage sampling module, 5 is a first current sampling module, 6 is a second current sampling module, and 7 is an isolation power supply.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
the invention discloses a battery simulation system supporting BMS active equalization function test, which comprises a main control module 1, an adjustable linear power supply 2, an impedance adjustable load 3 and a voltage sampling module 4, wherein the power supply signal input end of the adjustable linear power supply 2 is connected with the power supply input end through an isolation power supply 7, the adjustable linear power supply output voltage set value output end and the adjustable linear power supply overcurrent protection set value output end of the main control module 1 are connected with the corresponding input ends of the adjustable linear power supply 2, the impedance adjustable load voltage set value output end and the impedance adjustable load overcurrent protection set value output end of the main control module 1 are connected with the corresponding input ends of the impedance adjustable load 3, the load access end of the impedance adjustable load 3 is connected with the output end of the battery simulation system, the grounding end of the impedance adjustable load 3 is grounded, the acquisition end of the voltage sampling module 4 is connected between the output end and the, the voltage sampling value output end of the voltage sampling module 4 is respectively connected with the voltage feedback signal input ends of the main control module 1, the adjustable linear power supply 2 and the impedance adjustable load 3;
be connected with the sample termination of first current sampling module 5 between adjustable linear power supply 2 output and the battery analogue means output, the first current sampling module feedback current communication end of main control module 1 and adjustable linear power supply 2 is connected respectively to the sample current output of first current sampling module 5, be connected with the sample termination of second current sampling module 6 between the earthing terminal of the adjustable load of impedance 3 and the ground, the second current sampling module feedback current communication end of main control module 1 and the adjustable load of impedance 3 is connected respectively to the sample current output of second current sampling module 6.
The isolation power supply 7 is used to achieve isolation between the input and the output while converting the high voltage input from the external power supply to a low voltage suitable for the adjustable linear power supply.
The main control module 1 is used for transmitting an adjustable linear power supply output voltage set value Vset1 and an adjustable linear power supply overcurrent protection set value Iset1 to the adjustable linear power supply 2, and the main control module 1 is also used for transmitting an impedance adjustable load voltage set value Vset2 and an impedance adjustable load overcurrent protection set value Iset2 to the impedance adjustable load 3;
the voltage sampling module 4 is used for collecting the voltage at the output end of the battery simulation system and respectively transmitting a voltage sampling value Vsam to the adjustable linear power supply 2 and the impedance adjustable load 3;
the adjustable linear power supply 2 is used for outputting corresponding voltage (analog battery voltage) according to a comparison result of an adjustable linear power supply output voltage set value Vset1 and a voltage sampling value Vsam output by the sampling module 4, so that closed-loop feedback is formed, and the system output voltage Vsam is equal to the adjustable linear power supply output voltage set value Vset 1; the adjustable linear power supply 2 is also used for setting a corresponding overcurrent protection threshold according to an adjustable linear power supply overcurrent protection set value Iset1 (the overcurrent protection threshold setting is equal to the adjustable linear power supply overcurrent protection set value);
the impedance-adjustable load 3 is used for dynamically adjusting the impedance of the impedance-adjustable load according to a comparison result of an impedance-adjustable load voltage set value Vset2 and a voltage sampling value Vsam output by the voltage sampling module 4, so that closed-loop feedback is formed, and the voltage at the output end of the battery simulation system is stabilized at an impedance-adjustable load voltage set value Vset 2; the impedance-adjustable load 3 is further configured to set a corresponding overcurrent protection threshold (the overcurrent protection threshold is equal to the impedance-adjustable load overcurrent protection setting Iset2) according to the impedance-adjustable load overcurrent protection setting Iset2, and under a normal condition, when the current flowing through the impedance-adjustable load 3 is less than the impedance-adjustable load overcurrent protection setting Iset2, the impedance-adjustable load 3 operates in a constant-voltage load mode; when the current flowing through the impedance adjustable load 3 is not less than the impedance adjustable load overcurrent protection set value Iset2, the adjustable load works in a constant current load mode, and the purpose of overcurrent protection is achieved.
In the above technical solution, the voltage sampling module 4 is further configured to transmit the voltage sampling value Vsam to the main control module 1, and the main control module 1 compares the voltage sampling value Vsam with the adjustable linear power supply output voltage set value Vset1 and the impedance adjustable load voltage set value Vset2, respectively, so as to determine whether the adjustable linear power supply 2 and the impedance adjustable load 3 have a fault.
In the technical scheme, the linear power supply further comprises a first current sampling module 5, wherein the first current sampling module 5 is used for collecting the current Isam1 at the output end of the adjustable linear power supply 2 and transmitting the current Isam1 at the output end of the adjustable linear power supply 2 to the adjustable linear power supply 2, the current Isam1 at the output end of the adjustable linear power supply 2 is compared with the overcurrent protection set value Iset1 of the adjustable linear power supply, when the current Isam1 at the output end of the adjustable linear power supply 2 is smaller than the overcurrent protection set value Iset1 of the adjustable linear power supply, the adjustable linear power supply 2 outputs corresponding voltage according to the comparison result of the output voltage set value Vset1 of the adjustable linear power supply and the voltage sampling value Vsam output by the sampling module 4, the control voltage sampling value is equal to the output voltage set value of the adjustable linear power supply, and at the moment; when the current Isam1 at the output end of the adjustable linear power supply 2 is not less than the adjustable linear power supply overcurrent protection set value Iset1, the output of the adjustable linear power supply 2 is controlled by a comparison result of the adjustable linear power supply overcurrent protection set value Iset1 and the adjustable linear power supply 2 output end current Isam1, so that the output current of the adjustable linear power supply 2 is equal to the adjustable linear power supply overcurrent protection set value Iset1, the overcurrent protection effect is achieved, and at the moment, the adjustable linear power supply works in a current source mode.
In the above technical solution, the first current sampling module 5 is further configured to transmit the current Isam1 at the output end of the adjustable linear power supply 2 to the main control module 1, and the main control module 1 compares the current Isam1 at the output end of the adjustable linear power supply 2 with the set value Iset1 of the overcurrent protection of the adjustable linear power supply, so as to determine whether the adjustable linear power supply 2 has a fault.
In the above technical solution, the battery simulation system further includes a second current sampling module 6, where the second current sampling module 6 is configured to collect a current Isam2 flowing through the impedance-adjustable load 3, and transmit a current Isam2 flowing through the impedance-adjustable load 3 to the impedance-adjustable load 3, the impedance-adjustable load 3 compares a current Isam2 flowing through the impedance-adjustable load 3 with an impedance-adjustable load overcurrent protection setting Iset2, and when the current Isam2 flowing through the impedance-adjustable load 3 is less than the impedance-adjustable load overcurrent protection setting Iset2, the impedance of the impedance-adjustable load 3 is controlled by a comparison result between an impedance-adjustable load voltage setting Vset2 and a voltage sampling value Vsam output by the sampling module 4, so that the voltage at the output end of the battery simulation system is stabilized at the impedance-adjustable load voltage setting; when the current Isam2 flowing through the impedance-adjustable load 3 is larger than or equal to the impedance-adjustable load overcurrent protection set value Iset2, the impedance of the impedance-adjustable load 3 is controlled by a comparison result of the impedance-adjustable load overcurrent protection set value Iset2 and the current Isam2 flowing through the impedance-adjustable load 3, so that the current flowing through the adjustable load is limited to the impedance-adjustable load overcurrent protection set value Iset2 to achieve the overcurrent protection effect, and the adjustable load works in the constant-current load mode at the moment. The constant voltage type load is that the adjustment target of the load impedance is to keep the voltage at two ends of the load consistent with a set value, that is, the voltage sampling value Vsam is consistent with the impedance adjustable load voltage set value Vset2, when the active equalization charge equalization test is performed, the equalization circuit in the battery management system is equivalent to a constant current power supply, the current is output externally, at this time, the test device is required to absorb the current, and the voltage at the output port of the device is also required to be kept unchanged, at this time, the adjustable linear power supply 2 and the constant voltage type load are required to be realized in a matching way, the voltage is provided by the adjustable linear power supply 2, the charge equalization current of the battery management system is absorbed by the constant voltage type load under the condition that the voltage is kept unchanged (for example, the current impedance adjustable load voltage set value Vset2 is 3V, the active equalization charge current of the battery, the constant voltage load adjusts its impedance to 3 Ω so that the system output voltage becomes 1A × 3 Ω to 3V, and when the BMS actively equalizes the charging current to 2A, in order to keep the 3V voltage constant, the constant voltage load adjusts its impedance to 1.5 Ω so that the system output voltage becomes 2A × 1.5 Ω to 3V, and the voltage is kept constant).
In the above technical solution, the second current sampling module 6 is further configured to transmit the current Isam2 flowing through the impedance-adjustable load 3 to the main control module 1, and the main control module 1 compares the current Isam2 flowing through the impedance-adjustable load 3 with the impedance-adjustable load overcurrent protection setting value Iset2, so as to determine whether the impedance-adjustable load 3 has a fault (if the current Isam2 and the impedance-adjustable load overcurrent protection setting value Iset2 are inconsistent, it is determined that the fault exists).
In the above technical scheme, the impedance-adjustable load 3 is a constant-voltage load during normal operation, and is switched to a constant-current load during overcurrent protection; the adjustable linear power supply 2 is a voltage source during normal operation and is switched to a current source during overcurrent protection. If the tunable linear power supply 2 is not overcurrent protected when the battery management system is internally short circuited, its current becomes large, resulting in a burned-out circuit.
A battery simulation method of the system comprises the following steps:
step 1: the main control module 1 transmits an adjustable linear power supply output voltage set value Vset1 and an adjustable linear power supply overcurrent protection set value Iset1 to the adjustable linear power supply 2, and transmits an impedance adjustable load voltage set value Vset2 and an impedance adjustable load overcurrent protection set value Iset2 to the impedance adjustable load 3;
step 2: the voltage sampling module 4 collects the voltage of the output end of the battery simulation system and respectively transmits a voltage sampling value Vsam to the adjustable linear power supply 2 and the impedance adjustable load 3;
and step 3: the adjustable linear power supply 2 outputs corresponding voltage according to a comparison result of an adjustable linear power supply output voltage set value Vset1 and a voltage sampling value Vsam output by the voltage sampling module 4, controls the voltage sampling value to be equal to the adjustable linear power supply output voltage set value, and sets a corresponding overcurrent protection threshold according to the adjustable linear power supply overcurrent protection set value;
and 4, step 4: the impedance adjustable load 3 receives an impedance adjustable load voltage set value Vset2 output by the main control module 1 and a system output end voltage sampling value Vsam output by the voltage sampling module 4, and dynamically adjusts the impedance of the impedance adjustable load 3 according to the comparison result of the impedance adjustable load voltage set value Vset2 and the system output end voltage sampling value Vsam, so that the output end voltage of the battery simulation system is stabilized at an impedance adjustable load voltage set value Vset 2; the impedance-adjustable load 3 further sets a corresponding overcurrent protection threshold (the overcurrent protection threshold is equal to the impedance-adjustable load overcurrent protection set value Iset2) according to the impedance-adjustable load overcurrent protection set value Iset2, under a normal condition, the current flowing through the impedance-adjustable load 3 is less than the impedance-adjustable load overcurrent protection set value Iset2, and the impedance-adjustable load 3 works in a constant-voltage load mode; when the current flowing through the impedance-adjustable load 3 is larger than or equal to the impedance-adjustable load overcurrent protection set value Iset2, the impedance-adjustable load 3 works in a constant current load mode to achieve the aim of overcurrent protection;
and 5: the first current sampling module 5 collects the current Isam1 at the output end of the adjustable linear power supply 2 and transmits the current Isam1 at the output end of the adjustable linear power supply 2 to the adjustable linear power supply 2, the adjustable linear power supply 2 compares the current Isam1 at the output end of the adjustable linear power supply 2 with an adjustable linear power supply over-current protection set value Iset1, when the current Isam1 at the output end of the adjustable linear power supply 2 is smaller than the adjustable linear power supply over-current protection set value Iset1, the adjustable linear power supply 2 controls output according to the comparison result of an adjustable linear power supply output voltage set value Vset1 and a voltage sampling value Vsam, the control voltage sampling value is equal to the adjustable linear power supply output voltage set value, and the adjustable linear power supply 2; when the current Isam1 at the output end of the adjustable linear power supply 2 is not less than the adjustable linear power supply overcurrent protection set value Iset1, the output of the adjustable linear power supply 2 is controlled by a comparison result of the adjustable linear power supply overcurrent protection set value Iset1 and the adjustable linear power supply 2 output end current Isam1, so that the output current of the adjustable linear power supply 2 is equal to the adjustable linear power supply overcurrent protection set value Iset1, the overcurrent protection effect is achieved, and at the moment, the adjustable linear power supply 2 works in a current source mode;
the second current sampling module 6 collects a current Isam2 flowing through the impedance-adjustable load 3, and transmits a current Isam2 flowing through the impedance-adjustable load 3 to the impedance-adjustable load 3, the impedance-adjustable load 3 compares a current Isam2 flowing through the impedance-adjustable load 3 with an impedance-adjustable load overcurrent protection set value Iset2, and when the current Isam2 flowing through the impedance-adjustable load 3 is less than the impedance-adjustable load overcurrent protection set value Iset2, the impedance of the impedance-adjustable load 3 is controlled by a comparison result of an impedance-adjustable load voltage set value Vset2 and a system output end voltage Vsam, so that the output end voltage of the battery simulation system is stabilized at the impedance-adjustable load voltage set value; when the current Isam2 flowing through the impedance-adjustable load 3 is not less than the impedance-adjustable load overcurrent protection set value Iset2, the impedance of the impedance-adjustable load 3 is controlled by a comparison value of the impedance-adjustable load overcurrent protection set value Iset2 and the current Isam2 flowing through the impedance-adjustable load 3, so that the current flowing through the adjustable load is limited to the impedance-adjustable load overcurrent protection set value Iset2 to achieve the overcurrent protection effect, and the adjustable load works in a constant-current load mode at the moment;
step 6: the voltage sampling module 4 is further configured to transmit the voltage sampling value Vsam to the main control module 1, and the main control module 1 compares the voltage sampling value Vsam with an adjustable linear power supply output voltage set value Vset1 and an impedance adjustable load voltage set value Vset2, respectively, so as to determine whether the adjustable linear power supply 2 and the impedance adjustable load 3 have a fault;
the first current sampling module 5 transmits the current Isam1 at the output end of the adjustable linear power supply 2 to the main control module 1, and the main control module 1 compares the current Isam1 at the output end of the adjustable linear power supply 2 with an over-current protection set value Iset1 of the adjustable linear power supply, so as to judge whether the adjustable linear power supply 2 has a fault or not;
the second current sampling module 6 transmits the current Isam2 flowing through the impedance-adjustable load 3 to the main control module 1, and the main control module 1 compares the current Isam2 flowing through the impedance-adjustable load 3 with the impedance-adjustable load overcurrent protection set value Iset2, so as to determine whether the impedance-adjustable load 3 has a fault.
When the invention works in the discharge equilibrium state of the battery management system to be tested, as shown in fig. 2, R1 represents the equivalent impedance on the line, and point a represents the position of voltage sampling in fig. 1. When the battery management system to be tested is in a charge balance state, the internal balance circuit of the battery management system is equivalent to a constant current load and needs to absorb current, so that current flowing from the adjustable linear power supply 2 to the battery management system to be tested exists, the voltage at the point A tends to be reduced due to the existence of the current, and the adjustable linear power supply 2 improves the output voltage according to feedback at the moment, so that the voltage at the point A is kept consistent with a set value; meanwhile, the impedance-adjustable load 3 adjusts the self impedance according to the feedback, so that the self impedance is adjusted to be maximum and the current is hardly absorbed. And finally, the voltage of the point A is kept consistent with the set value, and the absorption balance current of the battery management system to be tested is provided by the adjustable linear power supply 2.
When the present invention works in the charge equalization state of the battery management system to be tested, as shown in fig. 3, R1 in the figure represents the equivalent impedance on the line, and point a represents the voltage sampling position in fig. 1. When the battery management system is in a charge balance state, the internal balance circuit of the battery management system to be tested is equivalent to a constant current source, so that the current direction flows out of the battery management system to be tested, when the current flows through the impedance adjustable load 3, the voltage at the point A has a rising trend, and the adjustable linear power supply 2 reduces the output voltage according to feedback, so that the output voltage of the adjustable linear power supply is equivalent to the voltage at the point A; meanwhile, the impedance adjustable load 3 adjusts the impedance of the battery management system to a proper value according to the feedback, so that the voltage of the point A generated after the balanced current of the battery management system flows through the impedance adjustable load 3 is consistent with the set value. And finally, the voltage of the point A is kept consistent with the set value, and the balance current output by the battery management system to be tested is absorbed by the adjustable load.
When the battery management system works in a sampling state, the port of the battery management system only absorbs small current relative to a discharge equilibrium state, and the whole adjusting process is consistent with the discharge equilibrium state.
The invention adopts a mode of combining the adjustable linear power supply and the adjustable load, and not only meets the requirement of simulating the battery voltage, but also meets the requirement of balancing the bidirectional flow of current during the active balancing function test.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (9)
1. The utility model provides a support battery analog system of BMS initiative balanced functional test which characterized in that: the device comprises a main control module (1), an adjustable linear power supply (2), an impedance adjustable load (3) and a voltage sampling module (4), wherein the main control module (1) is used for transmitting an adjustable linear power supply output voltage set value and an adjustable linear power supply overcurrent protection set value to the adjustable linear power supply (2), and transmitting an impedance adjustable load voltage set value and an impedance adjustable load overcurrent protection set value to the impedance adjustable load (3);
the voltage sampling module (4) is used for collecting the voltage of the output end of the battery simulation system and respectively transmitting the voltage sampling values to the adjustable linear power supply (2) and the impedance adjustable load (3);
the adjustable linear power supply (2) is used for outputting corresponding voltage according to a comparison result of an output voltage set value of the adjustable linear power supply and a voltage sampling value output by the sampling module (4), controlling the voltage sampling value to be equal to the output voltage set value of the adjustable linear power supply, and setting a corresponding overcurrent protection threshold according to the overcurrent protection set value of the adjustable linear power supply;
the impedance adjustable load (3) is used for adjusting self impedance according to a comparison result of an impedance adjustable load voltage set value and a voltage sampling value output by the voltage sampling module (4), so that the voltage of the output end of the battery simulation system is stabilized at the impedance adjustable load voltage set value, and a corresponding overcurrent protection threshold is set according to the impedance adjustable load overcurrent protection set value;
the impedance adjustable load (3) is a constant-voltage load during normal work and is a constant-current load during overcurrent protection;
the adjustable linear power supply (2) is a voltage source when in normal operation and is a current source when overcurrent protection occurs.
2. The battery simulation system supporting BMS active equalization function test of claim 1, wherein: the voltage sampling module (4) is also used for transmitting the voltage sampling value to the main control module (1), and the main control module (1) respectively compares the voltage sampling value with an adjustable linear power supply output voltage set value and an impedance adjustable load voltage set value so as to judge whether the adjustable linear power supply (2) and the impedance adjustable load (3) have faults or not.
3. The battery simulation system supporting BMS active equalization function test of claim 1, wherein: the adjustable linear power supply system further comprises a first current sampling module (5), wherein the first current sampling module (5) is used for collecting the current at the output end of the adjustable linear power supply (2) and transmitting the current at the output end of the adjustable linear power supply (2) to the adjustable linear power supply (2), the current at the output end of the adjustable linear power supply (2) is compared with the set value of the adjustable linear power supply overcurrent protection, when the current at the output end of the adjustable linear power supply (2) is smaller than the set value of the adjustable linear power supply overcurrent protection, the adjustable linear power supply (2) outputs corresponding voltage according to the comparison result of the set value of the adjustable linear power supply output voltage and the voltage sampling value output by the sampling module (4), and the voltage sampling value is controlled to be equal to the set value; when the current of the output end of the adjustable linear power supply (2) is larger than or equal to the overcurrent protection set value of the adjustable linear power supply, the output of the adjustable linear power supply (2) is controlled by the comparison result of the overcurrent protection set value of the adjustable linear power supply and the current of the output end of the adjustable linear power supply (2), and the output current of the adjustable linear power supply (2) is equal to the overcurrent protection set value of the adjustable linear power supply.
4. The battery simulation system supporting the BMS active equalization function test of claim 3, wherein: the first current sampling module (5) is also used for transmitting the current of the output end of the adjustable linear power supply (2) to the main control module (1), and the main control module (1) compares the current of the output end of the adjustable linear power supply (2) with an over-current protection set value of the adjustable linear power supply, so that whether the adjustable linear power supply (2) has a fault or not is judged.
5. The battery simulation system supporting BMS active equalization function test of claim 1, wherein: the battery simulation system further comprises a second current sampling module (6), wherein the second current sampling module (6) is used for collecting current flowing through the impedance-adjustable load (3) and transmitting the current flowing through the impedance-adjustable load (3) to the impedance-adjustable load (3), the impedance-adjustable load (3) compares the current flowing through the impedance-adjustable load (3) with an impedance-adjustable load overcurrent protection set value, and when the current flowing through the impedance-adjustable load (3) is less than the impedance-adjustable load overcurrent protection set value, the impedance of the impedance-adjustable load (3) is adjusted by a comparison result of an impedance-adjustable load voltage set value and a voltage sampling value output by the sampling module (4), so that the voltage of the output end of the battery simulation system is stabilized at the impedance-adjustable load voltage set value; when the current flowing through the impedance adjustable load (3) is larger than or equal to the impedance adjustable load overcurrent protection set value, the impedance of the impedance adjustable load (3) is controlled by the comparison result of the impedance adjustable load overcurrent protection set value and the current flowing through the impedance adjustable load (3), so that the current flowing through the adjustable load is limited to the impedance adjustable load overcurrent protection set value.
6. The battery simulation system supporting the BMS active equalization function test of claim 5, wherein: the second current sampling module (6) is further used for transmitting the current flowing through the impedance-adjustable load (3) to the main control module (1), and the main control module (1) compares the current flowing through the impedance-adjustable load (3) with an impedance-adjustable load overcurrent protection set value, so that whether the impedance-adjustable load (3) has a fault or not is judged.
7. A method for simulating a battery in a system according to claim 1, comprising the steps of:
step 1: the main control module (1) transmits an adjustable linear power supply output voltage set value and an adjustable linear power supply overcurrent protection set value to the adjustable linear power supply (2), and transmits an impedance adjustable load voltage set value and an impedance adjustable load overcurrent protection set value to the impedance adjustable load (3);
step 2: the voltage sampling module (4) collects the voltage of the output end of the battery simulation system and respectively transmits the voltage sampling values to the adjustable linear power supply (2) and the impedance adjustable load (3);
and step 3: the adjustable linear power supply (2) outputs corresponding voltage according to a comparison result of an output voltage set value of the adjustable linear power supply and a voltage sampling value output by the voltage sampling module (4), controls the voltage sampling value to be equal to the output voltage set value of the adjustable linear power supply, and sets a corresponding overcurrent protection threshold according to the overcurrent protection set value of the adjustable linear power supply;
and 4, step 4: the impedance adjustable load (3) adjusts the impedance of the load according to the comparison result of the voltage set value of the impedance adjustable load and the voltage sampling value output by the voltage sampling module (4), so that the voltage of the output end of the battery simulation system is stabilized at the voltage set value of the impedance adjustable load, and the corresponding overcurrent protection threshold is set according to the overcurrent protection set value of the impedance adjustable load.
8. The battery simulation method according to claim 7, characterized in that: step 4 is followed by step 5: the first current sampling module (5) collects the current at the output end of the adjustable linear power supply (2), and transmits the current at the output end of the adjustable linear power supply (2) to the adjustable linear power supply (2), the adjustable linear power supply (2) compares the current at the output end of the adjustable linear power supply (2) with an adjustable linear power supply over-current protection set value, when the current at the output end of the adjustable linear power supply (2) is smaller than the adjustable linear power supply over-current protection set value, the adjustable linear power supply (2) outputs corresponding voltage according to the comparison result of the adjustable linear power supply output voltage set value and the voltage sampling value output by the sampling module (4), and the voltage sampling value is controlled to be equal to the adjustable linear power; when the current of the output end of the adjustable linear power supply (2) is larger than or equal to the overcurrent protection set value of the adjustable linear power supply, the output of the adjustable linear power supply (2) is controlled by the comparison result of the overcurrent protection set value of the adjustable linear power supply and the current of the output end of the adjustable linear power supply (2), so that the output current of the adjustable linear power supply (2) is equal to the overcurrent protection set value of the adjustable linear power supply;
the second current sampling module (6) collects the current flowing through the impedance adjustable load (3) and transmits the current flowing through the impedance adjustable load (3) to the impedance adjustable load (3), the impedance adjustable load (3) compares the current flowing through the impedance adjustable load (3) with an impedance adjustable load overcurrent protection set value, when the current flowing through the impedance adjustable load (3) is less than the impedance adjustable load overcurrent protection set value, the impedance of the impedance adjustable load (3) is adjusted by a comparison result of an impedance adjustable load voltage set value and a voltage sampling value output by the sampling module (4), so that the voltage of the output end of the battery simulation system is stabilized at the impedance adjustable load voltage set value, when the current flowing through the impedance adjustable load (3) is more than or equal to the impedance adjustable load overcurrent protection set value, the impedance of the impedance adjustable load (3) is controlled by a comparison result of the impedance adjustable load overcurrent protection set value and the current flowing through the impedance adjustable load (3), thereby limiting the current flowing through the adjustable load to the impedance adjustable load over-current protection set value.
9. The battery simulation method according to claim 8, characterized in that: step 6 is also included after step 5: the voltage sampling module (4) is also used for transmitting the voltage sampling value to the main control module (1), and the main control module (1) respectively compares the voltage sampling value with an adjustable linear power supply output voltage set value and an impedance adjustable load voltage set value so as to judge whether the adjustable linear power supply (2) and the impedance adjustable load (3) have faults or not;
the first current sampling module (5) transmits the current of the output end of the adjustable linear power supply (2) to the main control module (1), and the main control module (1) compares the current of the output end of the adjustable linear power supply (2) with an overcurrent protection set value of the adjustable linear power supply so as to judge whether the adjustable linear power supply (2) has a fault or not;
the second current sampling module (6) transmits the current flowing through the impedance adjustable load (3) to the main control module (1), and the main control module (1) compares the current flowing through the impedance adjustable load (3) with an impedance adjustable load overcurrent protection set value so as to judge whether the impedance adjustable load (3) has a fault.
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